Lexus IS300 won't start despite strong battery current, seeking diagnostic suggestions on Lexus IS300

Submitted by Vehicle Owner · Aug 31, 2025
Published by RepairPal

Problem overview

Some Lexus IS300 owners report experiencing starting issues despite having a strong battery current, often due to a variety of underlying problems. These owners may find that a faulty starter can prevent the engine from starting properly, even when the battery is functioning well. Additionally, issues with the ignition system, such as a malfunctioning ignition switch, can also contribute to starting difficulties. Problems within the fuel system, including faulty fuel injectors or pumps, may arise, leading to complications despite a good battery. Furthermore, some owners discover that dirty or loose battery connections can cause starting issues, emphasizing the need for secure connections. A malfunctioning alternator may also be a concern, as it can hinder proper battery charging, resulting in starting difficulties. Lastly, checking for error codes with an OBD scanner can help identify specific issues that may be affecting the vehicle's ability to start.

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Lexus IS300 vehicles with this problem

1 model year affected

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